Integrated Science Instrument Module

[1] ISIM is the spacecraft chassis and instruments that take the light from the main mirror and convert that into the science data that is then sent back to Earth.

[5] NIRcam is extremely important to JWST, because it is not only a sensitive infrared camera, but it is also used to adjust the alignment of the main mirror segments.

[4] NIRcam was installed into ISIM in March 2014, and then underwent integration and testing after that, as the telescope was readied for its originally planned 2019 launch.

[1] The three regions include the cryogenic instrument module (1), the electronics compartment (2), and finally the Command and Data Handling subsystem and MIRI crycooler (3), which is inside the spacecraft bus physically.

[7] SpaceWire was developed by the European Space Agency (ESA), and provides low-power data communication at up to 200 Mbits per second.

[11] One of the considerations is to direct the majority of the heat (radiatively) in a roughly 20 degree angle in between the back of the main mirror structure and instruments and the sunshield.